NOISE REDUCIBLE SPIRAL TUBE

PURPOSE:To obtain the title tube which can only reduce noise having the same phase component and, at the same time, can exert a similar effect to a shielded cable also by forming a tape-like, for example, amorphous magnetic material to a spiral form after plastic coating, etc., is performed on the material. CONSTITUTION:This spiral tube 3 is constituted of a tape-like amorphous magnetic material 1 and plastic material 2 which covers the magnetic material 1 and is formed to a spiral tube. The magnetic material 1 functions as a, so called, common mode choke to the signal cable housed in the tube and only reduces noise having the same phase component without reducing the signals transmitted through the signal cable. Therefore, the spiral tube can reduce noise having the same phase component induced in a plurality of cables and, even when the tube is used for an electromagnetically shielded cable, the tube can reduce noise having the same phase component induced in the cable and shielding body.